copy a file in ruby

To copy a file in Ruby, you need to open the source file and the destination file, and then read from the source file and write to the destination file until you have copied the entire source file.

Here is an example function that copies a file in Ruby:

main.rb
def copy_file(source_file, destination_file)
  # Open the source file for reading in binary mode
  source = File.open(source_file, "rb")

  # Open the destination file for writing in binary mode
  destination = File.open(destination_file, "wb")

  # Read from the source file and write to the destination file until
  # the entire source file is copied
  while buffer = source.read(4096)
    destination.write(buffer)
  end

  # Close the files
  source.close
  destination.close
end
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In this example, the source_file and destination_file parameters are the paths to the source and destination files, respectively. The function opens the source file for reading in binary mode and the destination file for writing in binary mode (the "b" option is important because it ensures that the files are opened in binary mode, which is necessary for non-text files like images). The function then reads from the source file in chunks of 4096 bytes and writes those chunks to the destination file until the entire source file has been copied. Finally, the function closes the files.